运行后,就报这样的错误java.net.ConnectException: Connection refused: connect

Question

java.net.ConnectException: Connection refused: connect at java.base/java.net.DualStackPlainSocketImpl.connect0(Native Method) at java.base/java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source) at java.base/java.net.AbstractPlainSocketImpl.doConnect(Unknown Source) at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source) at java.base/java.net.AbstractPlainSocketImpl.connect(Unknown Source) at java.base/java.net.PlainSocketImpl.connect(Unknown Source) at java.base/java.net.SocksSocketImpl.connect(Unknown Source) at java.base/java.net.Socket.connect(Unknown Source) at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:121) at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:180) at org.apache.jmeter.protocol.http.sampler.hc.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:318) at org.apache.jmeter.protocol.http.sampler.MeasuringConnectionManager$MeasuredConnection.open(MeasuringConnectionManager.java:114) at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:610) at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:445) at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:835) at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83) at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.executeRequest(HTTPHC4Impl.java:697) at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.sample(HTTPHC4Impl.java:455) at org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:74) at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1189) at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1178) at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:490) at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:416) at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:250) at java.base/java.lang.Thread.run(Unknown Source)